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Port 7400RTPS DDS Discovery

RTPS Discovery protocol, integral to DDS, facilitates real-time, low-latency automatic discovery of publishers and subscribers in distributed real-time systems, ensuring seamless communication setup without manual configuration. It enables flexible and scalable data sharing ideal for IoT devices, robotics, defense, and industrial automation applications..

inNetwork ServicesSystemIoT
transport
tcp · udp

2 transports registered

in transit
cleartext

payload readable on path

assignment
official

registered with iana

risk
2/10

safe

lookups
14,820

rank 223 of 993 · top 22%

Technical Details

what runs on :7400

The Real-Time Publish-Subscribe (RTPS) protocol is a key component of the Data Distribution Service (DDS) middleware specification. Port 7400 is reserved as the default unicast discovery port used by RTPS for participant discovery, allowing distributed components to find and communicate with each other dynamically. RTPS supports both TCP and UDP transport, with UDP being more common for its low latency characteristics vital for real-time systems.

RTPS uses a decentralized approach to publish-subscribe messaging, supporting durable, transient, and volatile quality of service (QoS) profiles. This enables reliable data delivery tailored to application needs, whether for sensor update streams, command messages, or configuration data. The discovery mechanism uses specific multicast and unicast ports (including 7400) for endpoints to advertise capabilities and presence.

In distributed environments such as robotics, defense, autonomous vehicles, and Industrial IoT, RTPS over port 7400 ensures that DDS participants can seamlessly initiate communication. It enables dynamic network topologies without centralized servers, supporting scalability and resilience. Implementations include open-source packages like Eclipse Cyclone DDS, FastDDS, and commercial options conforming to the OMG DDS standard.

Security Information

exposure of :7400

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 3.9 across 604 ports — this one sits 1.9 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Common vulnerabilities:

  • Exposure of RTPS discovery ports to untrusted networks may allow attackers to eavesdrop or perform reconnaissance on DDS-enabled systems.
  • Lack of authentication or encryption can lead to spoofed discovery messages, resulting in forged entities joining the communication domain.
  • DoS attacks may target discovery traffic, disrupting dynamic association of publishers and subscribers and compromising real-time guarantees.

Common mitigations:

  • Restrict network access to port 7400 via firewall rules and network segmentation, exposing it only within trusted environments.
  • Enable DDS security extensions, including mutual authentication, access control, and data encryption to safeguard discovery and data exchanges.
  • Monitor DDS network traffic for anomalies, unexpected entities, or traffic spikes indicative of DoS attempts.
  • Use VLANs or overlay networks to isolate DDS domains, especially in multi-tenant or sensitive deployments.

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risk mix of the 8 listed

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